Potosa reddelli, Cruz-López & Francke, 2015

Cruz-López, Jesús A. & Francke, Oscar F., 2015, Cladistic analysis and taxonomic revision of the genus Karos Goodnight & Goodnight, 1944 (Opiliones, Laniatores, Stygnopsidae), Zoological Journal of the Linnean Society 175 (4), pp. 827-891 : 865

POTOSA REDDELLI SP. NOV.

( FIGS 38–40 , 58 , 60B )

Type material: MEXICO: Hidalgo: ♂ holotype, and 1 ♂ and 5 ♀ paratypes [ CNAN-T0797 and CNAN-

T0798 (18.iii.1981; J. Reddell, D. McKenzie, T. Archey, and F. Endres)], (21°5′55.96″N, 98°22′58.98″W). Municipio Huejutla, Cueva de San José, San José Ahuantempa .

Etymology: Patronym in honour of Mr James Reddell for his contributions to the knowledge of arachnids from Mexico, and as collector of the type specimens.

Diagnosis: Troglobitic species. Ocularium without armature ( Fig. 38C ). Dorsum roguse, only with few and very small tubercles ( Fig. 39C ). Glandular opening basal in metatarsus I ( Figs 39B , 60B ). Pars distalis with three to four lateral setae on each side, basal-most separat- ed from the others. Four pairs of ventral microsetae ( Fig. 40 ).

Description: Male holotype: Measurements: scutum length 3.1, maximum scutum width 2.5. Legs. I 1.35/ 0.50/0.95/1.27, II 2.05/0.72/1.75/1.80, III 1.65/0.45/1.45/ 1.62, IV 2.30/0.97/2.37/2.40. Dorsum. Rugose, ornamentation almost absent, only a few small tubercles present on central portion of areas II–IV. Sulcus between mesotergal areas not clearly visible ( Fig. 38B ). Free tergites with median row of rounded tubercles. Ocularium in the middle of prosoma, semitriangular in lateral view, rounded apically, unarmed, only covered by small tubercles ( Figs 38C , 39C ). Lateral clear areas projected in rounded, inconspicuous tubercles. Clear areas present on apices of area V and free tergites I and II, very low and inconspicuous. Venter. Covered uniformly by small, rounded tubercles. Stigmatic area long and constrained in the middle by median portion of coxa IV. Coxa IV with small dorsoectal dentiform tooth. Pedipalps. Patella with two mesal spiniform tubercles. Legs. Similar in ornamentation, densely covered by small rounded tubercles. Metatarsus I slightly swollen near base, glandular opening basal ( Figs 39B , 60B ). Legs IV wider than the rest, curved. Metatarsus II without clear annuli. Tarsal count 4(2):6(3):5/6:6. Male genitalia. Three or four lateral setae, basal pair noticeably separated from the rest. Four pairs of ventral microsetae, the two distal pairs separated from the rest ( Fig. 40 ). Female: Measurements: scutum length 3.1, maximum scutum width 2.5. Similar to male, with the following differences: metatarsus I without glandular opening ( Fig. 39B ) and tarsal count 4(2):6(3): 6:6.

Figures

Figure 38. Potosa reddelli sp. nov. A, habitus, dorsal view. B, scutum, dorsal view. C, ocularium, frontal view. Scale bars: A = 3.5 mm, B = 1.5 mm, C = 0.5 mm.

Figure 39. Potosa reddelli sp. nov. A, leg IV, mesal view. B, leg I, mesal view. C, scutum, lateral view. D, habitus, ventral view. Scale bars: A = 2 mm, B–D = 1 mm. Arrow in (B) indicates the glandular opening. The dark lines on (D) indicate the stigmatic area.

Figure 40. Potosa reddelli sp. nov. male genitalia. A, dorsal view. B, ventral view. C, lateral view. White arrows indicate ventral microsetae in (B) and parastylar setae in (A).

Figure 58. Distribution map of the species of the Karos genus-group, continued. Black circle, Montabunus foliorum; black square, Karos hexasetosus sp. nov.; white square with black outline, Karos monjarazi sp. nov.; black triangles, Potosa dybasi; white triangle with black outline, Potosa reddelli sp. nov.; black crosses, Chapulobunus poblano sp. nov.

Figure 60. A, ventral view of metatarsus I in male of Potosa dybasi; arrow indicates glandular opening. B, ventral view of metatarsus I in male of Potosa reddelli sp. nov.; arrow indicates glandular opening. C, swollen apical portion on femur II in male of Huasteca gratiosa. D, ventral view of pars distalis of Karos barbarikos; arrows indicate ventral microsetae. E, detail of ventral microsetae of pars distalis of Karos projectus. F, ventral view of pars distalis of Karos singularis sp. nov.; arrows indicate ventral microsetae. G, detail of apical portion of follis of Montabunus foliorum; arrow indicates the lateral projection of follis. H, detail of apical portion of follis of Chapulobunus poblano sp. nov.; arrow indicates the lateral projection of follis. I, apical portion of follis of Chapulobunus unispinosus; arrow indicates the lateral projection of follis.